stm32mp-t1000: Add dummy configuration

Add dummy configuration to enable compile for this machine

fdts/stm32mp-t1000.dts

+/* Devicetree file for basic t1000 SOM module
+ *
+ * These settings should work with most baseboards
+ *
+ * device    : stm32mp-t1000
+ * board code: 40099 130
+ * revision  : 03
+ *
+ * Kontron Electronics GmbH
+ * Copyright 2021 Kontron Electronics GmbH. All rights reserved.
+ */
+
+/* TODO: Use dedicated description for board */
+#include "stm32mp157c-ev1.dts"